Yarn breakage stop motions in textile machinery



Oct. 11, 1960 B BAsslNDALE 2,955,343

YARN BREAKAGE STOP MOTIONS IN TEXTILE MACHINERY Filed May 8, 1959 spool setting frame for YARN REAKAGn s'rorY Mo'rroNs IN TEXTIDEMACHMRY' Y Isaac Bradley Bassindale, Grasscroft, Oldham, England,

assignor to T.y M. M. (Research) Limited, Oldham, England,l v 'l Filed May 8, 1959.,.Sr-NL 81:1,879 Claims priority,- application Great Britain; May '9, 1958 kifclballll. (CI. 28-517 "i The invention relates to textile machinery in which large numbers of ends of material or y-arns are arranged for processing in sheet formation, that is to say, the ends or yarns are disposed in parallelism, substantially coplanar and in close proximity so that they collectively form a sheet stretched between feed mechanism at one vend and take-up mechanism at the other. Such an arrangement is found in warping apparatus for looms, Axminster spool setting frames, sizing machinery and elsewhere, and the necessity arises for the provision of means for detecting and indicating the breakage of any one of the ends or yarns (hereinafter referred to generally as threads) so that the machinery may be brought to a standstill as soon as possible.

One known arrangement of stop motion for this purpose takes the form of an interruptor device in the circuit of an electric motor by which the threads are driven, said interruptor being actuated a number of metal tumblers provided one for each thread, each tumbler being maintained in an inoperative position by the tension in the material but being capable of falling, if the tension is relaxed by a breakage, against a cont-actor -bar fixed across Vthe sheet of threads and thereby completing the interruptor circuit. Owing however to the close proximity of the threads in said known form of stop motion, it has been found diliicult to avoid interference between adjacent tumblers, and the object of the present invention is to provide an improved form of end breakage stop motion of the type above referred to, by which the aforesaid disadvantage may be obviated,

Vand which will be especially suitable for use in machinery,

such as Axminster spool setting frames, in which the sheet of threads is composed of differently coloured yarns arranged according to a given pattern, and in which it is frequently necessary to change the pattern to suit the requirements of the carpet design; the improvement provided by this invention is such that the threads may easily be withdrawn from the end breakage stop motion and re-arranged without a complicated or tedious threading operation.

In an end breakage stop motion as characterized by this invention, the tumblers are furnished with threadsupporting surfaces which are disposed at a plurality of different levels, so that .the thread sheet is no longer coplanar but has -adjacent threads at different heights, enabling adjacent threads to be selected and threaded through the separating device with certainty and without mutual interference.

The invention also provides in combination with the improved tumbler detector stop motion an improved constructional arrangement of reed, which is of lthe open top type conventional in Axminster spool setting frames, and which considerably facilitates the task of threading-up.

An embodiment of the invention, as applied to a Axminster carpet weaving, is

` illustrated in the accompanying drawings, of which by any one of i assembledz and mounted bined reed" and stop-motion feeler' assembly, and

Fig. 2 is' av front elevation thereof.-

The reed? comprises a number of' dents consisting of'A plates 50S having twoA legs 5-1', 521 meeting at' the top andy joined by a cross-bar 53 so as to` approximate to-an'f A-formation. Said? plates are" supported: by; transverse bars- 54 and? are the bases of thelegs.

the bars 54, and the arrangement is: such tha-t the sheety of yarns isf formed vinto"l two tiers. `Alternate yarns Xi forming the upper: tier rest upon. th said distance-pieces 55 whilst the alternate yarns Y forming the lower tier are supported by the upperedges of the bars 54.

Extending longitudinally of the assembly of plates 50, between the legs 51, 52 thereof, is a knife-edged bar 57 upon which are fulcrurned a series of tumblers. Said 'tumblers take the form of levers 58, 59 each provided with a notch 60 by which it rests on said fulcrum bar 57, and two arms 581, 582 (or 591, 592),

extending upwardly and terminating in a bearing face 583 (or 593) arranged to press against the underside of the yarn X (or Y) passing through one of the dents of the reed, Whilst the other arm 582 (or 592) depends towards a contactor bar 611 disposed beneath the fulcrum bar 57. The tumbler levers are two sizes, that s to say, each lever 58 has a longer upper arm 581 than its immediate neighbouring levers 59, so that the yarns X are held at a higher level than the yarns Y. 'Ihe levers 58 and 59 are alternately arranged along the reed. When a tumbler is in its rest position, in the absence of a yarn X (or Y) pressing upon its upper arm bearing surface 583 (or 593), the lower arm 582 (or 592) makes contact with the bar 61, as indicated in dot-ted ylines in Fig. 1, thus closing the electrical stopmotion circuit by which the machine is immediately stopped. When the machine is running `the tension of the unbroken yarns `suiiices -to hold the tumblers clear of the contactor bar V61.

The arrangement of the yarns X, Y at two different levels permits the use on the tumblers of broad upper bearing surfaces 583 (or 593) which are wider than the spaces between the plates constituting the reed, so that when a yarn is brought down between two plates, it must bear upon said surface 583 (or 593). The upper surfaces 583 of the longer tumbler levers are slightly narrower than the surfaces S93 of the shorter tumbler levers, so that suicient space is provided between adjacent surfaces 583 yto permit yarns to pass between them to the surfaces 593. The tumbler levers 58, 59 are loosely mounted on the fulcrum bar 57 and can easily be removed therefrom, vented by Athe cross-bars 53 of the reed-plates 50.

The improved tumbler arrangement has the advantage that when woollen and other hairy yarns are being used individual fibres are not stripped oi when the yarns pass over the bearing surfaces of the tumbler levers, as occurs in existing arrangements where it is necessary to thread yarns through a constricted hole.

What I claim as my invention and desired to secure by Letters Patent is:

1. Apparatus for use with means for driving a plurality of closely spaced threads arranged in sheet formation, comprising, a reed member having a plurality of closely spaced dents, a tumbler member between each of the dents pivotally mounted adjacent said reed, each of said tumbler members having upwardly extending thread supporting arms and alternate ones of said tumbler members having longer arms than the others whereby riveted in pairsv with interposed" metal distance-pieces SSYwhich': extend partwayf upwardly fronr The resultant vdouble dents are ini spaced notches: orsl'ots S6 inf upper surfaces ofi but accidental displacement is preat a higher level than the Y'3. An apparatus according to claim 2, wherein the width of the upwardly directed thread bearing surface to rock on its pivot, and thread driving stopping means' adjacent each of the said, tumblers in a location to be actuated thereby when said tumbler rocks onv its pivot due to failure of thread ,tension whereby to stop -the driving of said threads.

l 2. An apparatus according to claim 1, wherein each tumbler is a two-armed lever location, a knife edge member supported adjacentrsaid reed'upon which said lever is terminating in an upwardly directed bearing face for the thread and the other arm extending downwardly adjacent said thread driving stopping means.

supported at the ,notched location, one arm of said lever extending upwardly and,

having a notch at its pivotal be passed through the latter of each tumbler is greater than the spacing between dents of said reed.

4. An apparatus according to claim 1, wherein the thread bearing surface of the tumblers having their longer upwardly extending arms are narrower than those of said shorter armed tumblers whereby the threads may between the edges of the surfaces of the former.

References Cited in the tile: of this patent UNITED STATES PATENTS Mar. 16, 1886 Jan. 27, 1942 Denn Blom 

